When amber LEDs are combined with phosphor-converted blue LEDs, warm white light with both high CRI and high efficacy can be attained simultaneously.
Marc Dyble, product marketing manager of SSL products at Osram Opto Semiconductors discussed the potential of mixing monochromatic LEDs with phosphor-converted LEDs (PC-LEDs) to achieve high CRI and high efficacy at the same time. He presented this approach at the LED Show in Las Vegas last week.
However, Dyble contends that a color mixing approach should definitely prove better than methods that overdrive the LEDs and lead to early luminaire failure. In addition, from a user standpoint a tradeoff can be made between efficiency and color rendering by adjusting the monochromatic to PC-LED driving ratio. “One of the reasons we’ve been able to do this is because we’ve been able to linearize the efficiency of monochromatic LEDs,” said Dyble.
He added that Osram Opto and Cree have cross-licensing agreements in the area of color mixing.